Fix multiple constraints

requirements_detector/detect.py

@@ -1,12 +1,13 @@
 import re
 from pathlib import Path
-from typing import List, Union
+from typing import List, Optional, Union
 
 import toml
 
 from .exceptions import CouldNotParseRequirements, RequirementsNotFound
 from .handle_setup import from_setup_py
 from .poetry_semver import parse_constraint
+from .poetry_semver.version_constraint import VersionConstraint
 from .requirement import DetectedRequirement
 
 __all__ = [
@@ -102,6 +103,25 @@ def find_requirements(path: P) -> List[DetectedRequirement]:
     raise RequirementsNotFound
 
 
+def _version_from_spec(spec: Union[list, dict, str]) -> Optional[VersionConstraint]:
+    if isinstance(spec, list):
+        constraint = None
+        for new_constraint in [_version_from_spec(s) for s in spec]:
+            if constraint is None:
+                constraint = new_constraint
+            elif new_constraint is not None:
+                constraint = constraint.union(new_constraint)
+        return constraint
+
+    if isinstance(spec, dict):
+        if "version" in spec:
+            spec = spec["version"]
+        else:
+            return None
+
+    return parse_constraint(spec)
+
+
 def from_pyproject_toml(toml_file: P) -> List[DetectedRequirement]:
     requirements = []
 
@@ -116,15 +136,15 @@ def from_pyproject_toml(toml_file: P) -> List[DetectedRequirement]:
     for name, spec in dependencies.items():
         if name.lower() == "python":
             continue
-        if isinstance(spec, dict):
-            if "version" in spec:
-                spec = spec["version"]
-            else:
-                req = DetectedRequirement.parse(f"{name}", toml_file)
-                if req is not None:
-                    requirements.append(req)
-                    continue
-        parsed_spec = str(parse_constraint(spec))
+
+        parsed_spec_obj = _version_from_spec(spec)
+        if parsed_spec_obj is None and isinstance(spec, dict) and "version" not in spec:
+            req = DetectedRequirement.parse(f"{name}", toml_file)
+            if req is not None:
+                requirements.append(req)
+                continue
+        assert parsed_spec_obj is not None
+        parsed_spec = str(parsed_spec_obj)
         if "," not in parsed_spec and "<" not in parsed_spec and ">" not in parsed_spec and "=" not in parsed_spec:
             parsed_spec = f"=={parsed_spec}"
 

tests/test_poetry_semver/test_main.py

@@ -196,3 +196,17 @@ def test_versions_are_sortable(unsorted, sorted_):
     sorted_ = [parse_constraint(s) for s in sorted_]
 
     assert sorted(unsorted) == sorted_
+
+
+@pytest.mark.parametrize(
+    "constraint, expected",
+    [
+        ([
+    {'version': "<=1.9", 'python': ">=3.6,<3.8"},
+    {'version': "^2.0", 'python': ">=3.8"}
+], VersionUnion(VersionRange(max=Version(1, 9), include_max=True), VersionRange(Version(2), Version(3), True)))
+
+])
+def test_versions_list(constraint, expected):
+    from requirements_detector.detect import _version_from_spec
+    assert _version_from_spec(constraint) == expected